package com.xj.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xj.reggie.common.CustomException;
import com.xj.reggie.dto.SetmealDto;
import com.xj.reggie.entity.Setmeal;
import com.xj.reggie.entity.SetmealDish;
import com.xj.reggie.mapper.SetmealMapper;
import com.xj.reggie.service.SetmealDishService;
import com.xj.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @Author XJ
 * @Date 2022/10/18 19:38
 * @PackageName:com.xj.reggie.service.impl
 * @ClassName: SetmealServiceImpl
 * @Description: TODO
 * @Version 1.0
 */
@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

	@Autowired
	private SetmealDishService setmealDishService;

	/**
	 * 新增套餐，同时需要保存套餐和菜品的关联关系
	 * @param setmealDto
	 */
	@Transactional
	public void saveWithDish(SetmealDto setmealDto) {
		//保存套餐的基本信息，操作setmeal，执行insert操作
		this.save(setmealDto);

		List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
		setmealDishes.stream().map((item)->{
			item.setSetmealId(setmealDto.getId());
			return item;
		}).collect(Collectors.toList());

		//保存套餐和菜品的关联信息，操作setmeal_dish，执行insert操作
		setmealDishService.saveBatch(setmealDishes);
	}

	/**
	 * 删除套餐，同时需要删除套餐和菜品的关联数据
	 * @param ids
	 */
	@Transactional
	public void removeWithDish(List<Long> ids) {
		//查询套餐状态，确定是否可以删除
		LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper();
		queryWrapper.in(Setmeal::getId,ids);
		queryWrapper.eq(Setmeal::getStatus,1);

		int count = (int) this.count(queryWrapper);
		if(count > 0){
			//如果不能删除，抛出一个业务异常
			throw new CustomException("套餐正在售卖中，不能删除！");
		}

		//如果可以删除，先删除套餐表中的数据---setmeal
		this.removeByIds(ids);


		//delete from setmeal_dish where setmeal_id in(1,2,3)
		LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
		lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);

		//删除关系表中的数据---setmeal_dish
		setmealDishService.remove(lambdaQueryWrapper);
	}

	/**
	 * 根据套餐id修改售卖状态
	 * @param status
	 * @param ids
	 */
	@Override
	public void updateSetmealStatusById(Integer status,  List<Long> ids) {
		LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper();
		queryWrapper.in(ids !=null,Setmeal::getId,ids);
		List<Setmeal> list = this.list(queryWrapper);

		for (Setmeal setmeal : list) {
			if (setmeal != null){
				setmeal.setStatus(status);
				this.updateById(setmeal);
			}
		}
	}

	/**
	 * 回显套餐数据：根据套餐id查询套餐
	 * @return
	 */
	@Override
	public SetmealDto getDate(Long id) {
		Setmeal setmeal = this.getById(id);
		SetmealDto setmealDto = new SetmealDto();
		LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper();
		//在关联表中查询，setmealdish
		queryWrapper.eq(id!=null,SetmealDish::getSetmealId,id);

		if (setmeal != null){
			BeanUtils.copyProperties(setmeal,setmealDto);
			List<SetmealDish> list = setmealDishService.list(queryWrapper);
			setmealDto.setSetmealDishes(list);
			return setmealDto;
		}
		return null;
	}
}
